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一個國中的數學問題(20點)
Aug 21st 2013, 11:07

來囉~

長12公分、寬9公分的長方形紙要他們用這張紙當曲面或側面,各做一個高9公分的

圓柱和底面是正方形的四角柱

你只能剪12cm這邊的(因圓柱限定條件) 寬被限定只能9

設正方形周長 x 園周為y 所以 x+y=12

數對=(x,y)=(1,11) (2,10) (3,9) (4,8) (5,7) (6,6)

=(11,1) (10,2) (9,3) (8,4) (7,5) (6,6)

因正方形每邊等長 故周長必為4的倍數 而符合的有(4,8) (8,4)

所以(正方體側面積,圓柱體側面積)=( 36,72) or(72 ,36) 裁成2片矩形

參考資料: 數學高手 Me

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